期刊
NUCLEAR PHYSICS A
卷 696, 期 3-4, 页码 605-622出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0375-9474(01)01151-4
关键词
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The f sum rule is derived in a nonrelativistic frame and connected, via Ward identities, to the two photon term of the Compton scattering. A generalisation to isospin symmetry in the nuclear case is discussed and linked to the meson exchange currents. The extension to a fully relativistic theory is then discussed and it is shown that the energy-weighted sum rule becomes a relation between the particle-hole and particle-antiparticle emission. Moreover the generalisation to isospin symmetry is derived and provides nonperturbative results. (C) 2001 Elsevier Science B.V. All rights reserved.
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